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  <title>Applies a function on the image</title>
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<div id="layout">
  <div id="layout-content"><div id="imagick.functionimage" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">Imagick::functionImage</h1>
  <p class="verinfo">(PECL imagick 2 &gt;= 2.3.0, PECL imagick 3)</p><p class="refpurpose"><span class="refname">Imagick::functionImage</span> &mdash; <span class="dc-title">Applies a function on the image</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-imagick.functionimage-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>Imagick::functionImage</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$function</code></span>, <span class="methodparam"><span class="type">array</span> <code class="parameter">$arguments</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$channel</code><span class="initializer"> = Imagick::CHANNEL_DEFAULT</span></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Applies an arithmetic, relational, or logical expression to a pseudo image.
  </p>
  <p class="para">
   See also <a href="http://www.imagemagick.org/Usage/transform/#function" class="link external">&raquo;&nbsp;ImageMagick
   v6 Examples - Image Transformations — Function, Multi-Argument Evaluate</a>
  </p>
  <p class="para">
   此方法在Imagick基于ImageMagick 6.4.9以上版本编译时可用。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-imagick.functionimage-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">function</code></dt>

     <dd>

      <p class="para">
       Refer to this list of <a href="imagick.constants.html#imagick.constants.function" class="link">function constants</a>
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">arguments</code></dt>

     <dd>

      <p class="para">
       Array of arguments to pass to this function.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-imagick.functionimage-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>。
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-imagick.functionimage-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   错误时抛出 ImagickException。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-imagick.functionimage-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2771">
    <p><strong>示例 #1 Create a sinusoidal gradient</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$imagick&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$imagick</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">newPseudoImage</span><span style="color: #007700">(</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'gradient:black-white'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$arguments&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #0000BB">3</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">90</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$imagick</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">functionImage</span><span style="color: #007700">(</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">::</span><span style="color: #0000BB">FUNCTION_SINUSOID</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$arguments</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-Type:&nbsp;image/png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$imagick</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">setImageFormat</span><span style="color: #007700">(</span><span style="color: #DD0000">"png"</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">$imagick</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getImageBlob</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="mediaobject">
     
     <div class="imageobject">
      <img src="images/c0d23d2d6769e53e24a1b3136c064577-functionImage_sinusoidal.png" alt="Output of create a sinusoidal gradient" width="200" height="200" />
     </div>
    </div>
   </div>
   
   <div class="example" id="example-2772">
    <p><strong>示例 #2 Create a gradient from the polynomial (4x^2 - 4x + 1) </strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$imagick&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$imagick</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">newPseudoImage</span><span style="color: #007700">(</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'gradient:black-white'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$arguments&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #0000BB">4</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">4</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$imagick</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">functionImage</span><span style="color: #007700">(</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">::</span><span style="color: #0000BB">FUNCTION_POLYNOMIAL</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$arguments</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-Type:&nbsp;image/png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$imagick</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">setimageformat</span><span style="color: #007700">(</span><span style="color: #DD0000">"png"</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">$imagick</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getImageBlob</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="mediaobject">
     
     <div class="imageobject">
      <img src="images/c0d23d2d6769e53e24a1b3136c064577-functionImage_polynomial.png" alt="Output of create a polynomial gradient" width="200" height="200" />
     </div>
    </div>
   </div>

   <div class="example" id="example-2773">
    <p><strong>示例 #3 Create a complex gradient from the polynomial (4x^2 - 4x^2 + 1) modulated by a sinusoidal gradient </strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$imagick1&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$imagick1</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">newPseudoImage</span><span style="color: #007700">(</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'gradient:black-white'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$arguments&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #0000BB">9</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">90</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$imagick1</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">functionImage</span><span style="color: #007700">(</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">::</span><span style="color: #0000BB">FUNCTION_SINUSOID</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$arguments</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$imagick2&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$imagick2</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">newPseudoImage</span><span style="color: #007700">(</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'gradient:black-white'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$arguments&nbsp;</span><span style="color: #007700">=&nbsp;array(</span><span style="color: #0000BB">0.5</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$imagick2</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">functionImage</span><span style="color: #007700">(</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">::</span><span style="color: #0000BB">FUNCTION_SINUSOID</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$arguments</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$imagick1</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">compositeimage</span><span style="color: #007700">(</span><span style="color: #0000BB">$imagick2</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">Imagick</span><span style="color: #007700">::</span><span style="color: #0000BB">COMPOSITE_MULTIPLY</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-Type:&nbsp;image/png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$imagick1</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">setImageFormat</span><span style="color: #007700">(</span><span style="color: #DD0000">"png"</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">$imagick1</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getImageBlob</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="mediaobject">
     
     <div class="imageobject">
      <img src="images/c0d23d2d6769e53e24a1b3136c064577-functionImage_multiplied.png" alt="Output of create complex gradient" width="200" height="200" />
     </div>
    </div>
   </div>

  </p>
 </div>


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